钢箱梁桥面板爆炸冲击响应数值模拟研究

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (5) : 77-81.

论文

钢箱梁桥面板爆炸冲击响应数值模拟研究

蒋志刚，白志海，严波，朱新明

作者信息 +

Numerical simulation study on response of a steel box girder deck to blast loading

JIANG Zh-igang; BAI Zhi-hai; YAN Bo; ZHU Xin-ming

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文章历史 +

摘要

大跨度缆索承重桥梁遭受恐怖爆炸袭击的风险比一般桥梁大。运用LS-DYNA非线性有限元软件，研究了箱包炸弹和小轿车炸弹（TNT当量10kg-500kg）桥面爆炸冲击作用下缆索承重桥梁钢箱梁正交异性桥面板的塑性变形、开裂与破口及耗能。结果表明：桥面板的主要耗能机制为盖板和加劲肋的塑性变形耗能，占爆炸输入能量的70%以上；加劲肋和横隔板对桥面板破口有约束作用，TNT当量为300kg-500kg时，纵桥向破口尺寸小于等于横隔板间距，并小于横桥向破口尺寸

Abstract

Large span cable-supported bridges suffer greater risk of terror explosion than normal bridges. The plastic deformation, rupture, tearing and energy dissipation of the orthotropic steel deck under blasting loads of hand-placed bombs and sedan bombs (TNT equivalent 10kg-500kg) were investigated with nonlinear finite element software LS-DYNA. The results show that: the bridge deck’s main energy dissipation mechanisms are the plastic deformation of cover plates and lengthways stiffeners, and the ratio of plastic deformation energy to explosion energy exceeds 70%; the rupture of deck is constrained by the stiffeners and diaphragms, the lengths of ruptures in lengthways are no longer than the distance between two diaphragms, and less than those in width way while the TNT equivalent is from 300kg to 500kg..

导出引用

蒋志刚;白志海;严波;朱新明. 钢箱梁桥面板爆炸冲击响应数值模拟研究[J]. 振动与冲击, 2012, 31(5): 77-81

JIANG Zh-igang;BAI Zhi-hai;YAN Bo;ZHU Xin-ming. Numerical simulation study on response of a steel box girder deck to blast loading[J]. Journal of Vibration and Shock, 2012, 31(5): 77-81